android——文件目录选择

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主活动的布局文件 activity_main.xml

显示图片如下

创建适配器所需的布局文件 adapter.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/adapter_listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/adapter_image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.48"
            android:src="@drawable/ic_launcher" />

        <TextView
            android:id="@+id/adapter_filename"
            android:layout_width="242dp"
            android:layout_height="match_parent"
            android:text="TextView" />
    </LinearLayout>

</LinearLayout>

主活动程序 MainActivity.java

package com.example.filedirec;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class MainActivity extends Activity {
   private Button chooseFile;
   private TextView fileDire;
   private String curPath = new String("/");

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       chooseFile = (Button)findViewById(R.id.filedire_button1);
       fileDire = (TextView)findViewById(R.id.filedire_textView1);

       chooseFile.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View arg0) {
               // TODO Auto-generated method stub
               openCurDir(curPath);
           }
       });
   }

   private void openCurDir(String curPath){
       File f = new File(curPath);
       File[] file = f.listFiles();
       final List<Map<String,Object>> listItem = new ArrayList<Map<String,Object>>();

       if(!curPath.equals("/")){//如果不是根目录的话就在要显示的列表中加入此项
           Map<String,Object> map1=new HashMap<String,Object>();
           map1.put("name", "返回上一级目录");
           map1.put("image", R.drawable.back02);
           map1.put("path",f.getParent());
           map1.put("isDire", true);
           listItem.add(map1);
       }

       if(file != null){//必须判断否则目录为空的时候会报错
           for(int i = 0; i < file.length; i++){
               Map<String,Object> map=new HashMap<String,Object>();
               map.put("name", file[i].getName());
               map.put("image", (file[i].isDirectory()) ? R.drawable.folder : R.drawable.doc);
               map.put("path",file[i].getPath());
               map.put("isDire", file[i].isDirectory());
               listItem.add(map);
           }
       }

       SimpleAdapter adapter = new SimpleAdapter(MainActivity.this,listItem,R.layout.adapter,
               new String[]{"name","image"},new int[]{R.id.adapter_filename,R.id.adapter_image});

       final AlertDialog.Builder b =new Builder(MainActivity.this);
       b.setAdapter(adapter, new DialogInterface.OnClickListener() {

           @Override
           public void onClick(DialogInterface arg0, int arg1) {
               // TODO Auto-generated method stub
               if((Boolean) listItem.get(arg1).get("isDire")){
                   openCurDir((String)listItem.get(arg1).get("path"));
               }else{
                   fileDire.setText((String)listItem.get(arg1).get("path"));
               }
           }
       });
       b.show();
   }

}

对话框显示如下

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